PSNB 1.3

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1.3 Drifting Continents

Vocabulary

Pangea: All continents used to be joined into a super continent. Means- All lands.
Continental Drift: The moving?separation of the continents.
Fossil: Any trace of an ancient object, that has been preserved in rock.

Outline

  • Introduction

    • Africa and South America fit together like a jigsaw puzzle

  • The Theory of Continental Drift

    • 1910 Alfred Wegner
    • Hypothesis- All continents were joined together (Pangea)
    • Joined 300 million years ago
    • Gathered lots of evidence

  • Evidence from landforms
    • Mountains
      • Lined up edges of continents
      • South Africa and Argentina
    • Evidence from coal fields
      • European coal fields in North America
  • Evidence from Fossils
  • Found dinosaur and plant fossils of
**Evidence from climate
    • Current places in the world had opposite climate
    • Hot places had rock scratches, indicated glaciers were there

  • Scientists reject Wegener's theory

    • No one payed attention to his theory till 40 years after he died
    • Because then they had more clues about the Continental Drift





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